Abstract
Is a short-stage protocol during an incremental exercise test reliable for heart rate variability threshold analysis?
Highlights
Heart rate variability (HRV) consists of the fluctuations in R-R interval between successive heartbeats defined by the distance between two R-waves on the electrocardiogram[1,2]
No differences were observed between heart rate (HR) assessed at first, second and third minute in the initial stage of exercise test (p = 0.21, ηp2= 0.17) or in the stage corresponding to heart rate variability threshold (HRVT)
Low HR was observed for HRVTV1 compared to HRVTV3 (p = 0.04, ηp2 = 0.19) and for HR assessed in the first and second minute compared to the third minute in the last stage of incremental exercise test (IET) (p
Summary
Heart rate variability (HRV) consists of the fluctuations in R-R interval (iRR) between successive heartbeats defined by the distance between two R-waves on the electrocardiogram[1,2]. HRV has been used either in sports or in clinical settings as a proxy of the cardiac autonomic function[3,4]. In this sense, different HRV methods and indices have been proposed to evaluate the parasympathetic activation or its withdraw associated with various physiological conditions such as exercise[5,6]. The point where the values of SD1 is stabilized is called heart rate variability threshold (HRVT) and it is considered an indicator of the parasympathetic activity plateau during the IET5,7. The analysis of HRVT emerges as a reproducible[13], noninvasive and low-cost strategy for the anaerobic threshold (AT) determination[8,12]
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